potential exception point when viewing structure in Chimera

During a protracted session of loading large structures and having Chimera time out whilst trying to display or colour them, I noticed NumberFormatException's being raised from the Chimera mapping code. Tracked it down to a routine in jalview.ext.rbvi.strucviz2.ChimeraResidue:

  public void splitInsertionCode(String residue)
  {
    // OK, split the index into number and insertion code
    Pattern p = Pattern.compile("(\\d*)([A-Z]?)");
    Matcher m = p.matcher(residue);
    if (m.matches())
    {
      this.residueNumber = Integer.parseInt(m.group(1));

Presumably, 'residue' was an empty string, which caused the parseInt to fail.